Precious stone



FIG. 1 is a top view, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is rear view thereof;

FIG. 5 is a left view thereof; and,

FIG. 6 is a right view thereof. 

I claim, the ornamental design for a precious stone, as shown. 